CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 79,961	$ 80,900
Short-term investments	38,112	27,944
Trade accounts receivable, less allowance of $8,299 and $6,591	429,684	368,377
Other receivables, including advances to independent contractors, less allowance of $4,951 and $5,384	51,766	53,263
Deferred income taxes and other current assets	20,202	21,308
Total current assets	619,725	551,792
Operating property, less accumulated depreciation and amortization of $154,657 and $145,804	163,569	142,146
Goodwill	57,470	57,470
Other assets	68,618	57,041
Total assets	909,382	808,449
Current Liabilities
Cash overdraft	26,719	25,905
Accounts payable	212,653	163,307
Current maturities of long-term debt	19,366	17,212
Insurance claims	68,410	76,624
Other current liabilities	45,526	48,065
Total current liabilities	372,674	331,113
Long-term debt, excluding current maturities	99,748	115,130
Insurance claims	25,386	27,494
Deferred income taxes and other noncurrent liabilities	40,141	34,135
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 66,855,922 and 66,602,486 shares	669	666
Additional paid-in capital	172,455	165,712
Retained earnings	1,035,003	947,156
Cost of 20,386,462 and 19,882,289 shares of common stock in treasury	(838,273)	(813,684)
Accumulated other comprehensive income	1,579	727
Total shareholders' equity	371,433	300,577
Total liabilities and shareholders' equity	$ 909,382	$ 808,449